In the days before serial numbers, relic cards, certified autographs and countless parallels, simple base insert cards ruled the hobby. The first modern insert cards arrived on the market in the late 1980s, but it wasn’t until the early 1990s that the insert card craze truly swept the hobby, aided in part by rising young superstars Ken Griffey Jr. and Frank Thomas.
In the coming weeks, we will be taking a look back at some of the more memorable insert sets from that era and their progression over the years.